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Battery Tenders as recharging tools . . .

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nuckollsr(at)cox.net
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Posted: Tue Feb 13, 2007 4:49 am Post subject: Battery Tenders as recharging tools . . .

At 05:51 AM 2/13/2007 -0600, you wrote:



 	  Quote: 	
		  

<willslau(at)alumni.rice.edu>



Battery Tender has quite a few different models, and the info on their

website indicates that they use different charging algorithms. I could not

find the "021-0123" model number on the Deltran website, but judging by the

0.8A rating, it would be a Battery Tender Jr.. I have a Battery Tender Plus,

which is rated at 1.25A, and uses a different charging algorithm than the

Jr., and the charging profile shown for it on the Deltran Technical Info

page looks a lot more like the curve you got from the Schumacher. I'd be

willing to loan mine out for a test run if you want.


	


   Sounds like a deal to me.  I was surprised that when I discharged

   the test battery after charging with the Battery Tender Jr, the battery

   gave up about the same energy as it did for the initial discharge.

   Just over 12AH at the 3.0A rate.



   I'd appreciate having access to your BT+ to include in the

   series of experiments. I'll be sharing the data from the tests

   with folks at Concord too. Their battery gurus will be able

   to put the sanity check on our results.



   If you could ship your charger to me at 6936 Bainbridge,

   Wichita, KS  67226 I should be able to get it back to you

   in a day or so after receiving it.



   Bob . . .

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nuckollsr(at)cox.net
Guest

Posted: Tue Feb 13, 2007 5:11 am Post subject: Battery Tenders as recharging tools . . .

At 12:18 AM 2/13/2007 -0600, you wrote:



 	  Quote: 	
		  



I have a Battery Minder on my Gill G-35 battery now too.  Before I used 

it, my battery used to hover around 12.2V when the plane was shut down.  I 

ran the battery nearly dead once trying to start the engine when the 

weather had dropped below 30 degrees.  After using the Battery Minder on 

it for about 3 days, it fired the engine up on a 25 degree morning in only 

about 5 blades, and the battery sits at over 13V when the plane is shut down.


	


     It would be interesting to do a recharge test profile

     on a Battery Minder too . . . but I suspect it's very

     much like the Battery Tender. I have used Battery Tenders

     here in my shop for several years to keep batteries topped-off

     on the bench. My father-in-law has used them on his vehicles

     too. They do the battery maintenance job just fine.



     What were investigating here is an assertion supplied by

     someone on the web that these smallest of battery maintenance

     devices are unsuitable for use as chargers . . . i.e. replenishing

     the energy in a heavily discharged battery.



     The recharge profile measured on my Battery Tender Jr did

     not have all the features offered by some other chargers.

     I've attached a snippet of the trace on the Schumacher recharge

     profile just completed. It topped out at 14.4 volts, only

     about 0.5 volts higher than the Battery Tender Jr. At this

     point in the recharge cycle, the battery is accepting only

     hundreds of milliamperes of recharge current so these "dwells"

     at the top-off voltage don't represent much total energy.

     But in this case we do see the upward inflection in voltage that

     begins right at 14.0 volts.



     This may account for the fact that BTJr's performance as

     a charger isn't all that bad. It stopped pushing energy into

     the battery at about 13.9 volts. We shall see . . .



     Bob . . .

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willslau(at)alumni.rice.e
Guest

Posted: Tue Feb 13, 2007 7:32 pm Post subject: Battery Tenders as recharging tools . . .

I'll try and get it packed up as soon as practical, but I've got a lot of

irons in the fire this week, and it might well be Saturday before I can get

it on it's way.



William



--

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